Knee pad



FIG. 1 is a front perspective of a knee pad showing our new design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a back elevation view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a bottom plan view thereof; and,

FIG. 6 is a side elevation view thereof.

The broken lines represent the portions of the design that form no part of the claim. 

CLAIM The ornamental design for a knee pad, as shown and described. 